Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.text.TextUtils;
import java.util.Random;

public class Main {
    public static final String LOWER_CASE_LETTERS = "abcdefghijklmnopqrstuvwxyz";

    public static String getRandomLowerCaseLetters(int length) {
        return getRandom(LOWER_CASE_LETTERS, length);
    }

    public static String getRandom(String source, int length) {
        return TextUtils.isEmpty(source) ? null : getRandom(source.toCharArray(), length);
    }

    public static String getRandom(char[] sourceChar, int length) {
        if (sourceChar == null || sourceChar.length == 0 || length < 0) {
            return null;
        }

        StringBuilder str = new StringBuilder(length);
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            str.append(sourceChar[random.nextInt(sourceChar.length)]);
        }
        return str.toString();
    }

    public static int getRandom(int max) {
        return getRandom(0, max);
    }

    public static int getRandom(int min, int max) {
        if (min > max) {
            return 0;
        }
        if (min == max) {
            return min;
        }
        return min + new Random().nextInt(max - min);
    }
}